Tag it with something like shutdown=non-biz-hours, or can even specify a schedule that a lambda function can pick up each minute or hour and parse to stop/start any instance that falls within that window.
But since a Lambda is a program, you can make the criteria as complex as you like.
Tag it with "shutdown=non-biz-hours", and "timezones=UTC-7,UTC+0,UTC+5:30" and your shutdown script can figure out when it's outside of business hours in all of those timezones and shut it down.